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Dari hasil berikut, didapat:
3x - y = 12
x + y = 8
Eliminasi, dengan menjumlahkan:
4x = 20
x = 5
Dan,
x + y = 8
5 + y = 8
y = 3
Sehingga,
2x - 2y = 2(x-y)
= 2(5-3)
= 2 x 2
= 4
Matriks =
Jawab :
3x - y = 12
y = 3x - 12
x + y = 6
x + 3x - 12 = 6
4x - 12 = 6
4x = 18
x = 9/2
y = 3(9/2) - 12 |x2|
2y = 6(9) - 24
2y = 54 - 24
2y = 30
y = 15
2x - 2y =
2(9/2) - 2(15)
9 - 30 = -21
#Maaf kalau ada yang salah